AI image API · Black Forest Labs

FLUX 3 Klein Image Base API pricing per image

Generate images with Black Forest Labs's FLUX 3 Klein Image Base through the Cut.Pro API. You see the price before you generate and pay only for what you use.

  • Pay as you go, no subscription
  • 15 free credits on a new account
  • Free quote before every call
From$0.31per imageR$1.04 · 18 credits10 images: $3.12Updated November 07, 2026

Pricing

FLUX 3 Klein Image Base pricing by mode and resolution

ModeResolutionPrice per imageIn reaisCredits
Text only2k$0.31R$1.0418 credits
With references2k$0.47R$1.5727 credits

Updated November 07, 2026. Prices use the cheapest credit pack: 1 credit costs $0.0179 (R$0.0599).

Limits

What FLUX 3 Klein Image Base accepts in each request

Modes
Text only and With references
Resolutions
2k
Aspect ratios
21:9, 16:9, 3:2, 4:3, 5:4, 1:1, 4:5, 3:4, 2:3, 9:16
Reference images
up to 3

Code

How to call FLUX 3 Klein Image Base free quote, generation and result

BODY='{"model":"bfl/flux-3-klein-image-base","prompt":"product photo of a white sneaker on a studio background"}'

CREDITS=$(curl -s -X POST https://api.cut.pro/api/v1/generations/quote \
  -H "X-Api-Key: $CUTPRO_API_KEY" \
  -H "Content-Type: application/json" \
  -d "$BODY" | jq .credits)

curl -X POST "https://api.cut.pro/api/v1/generations?wait=60" \
  -H "X-Api-Key: $CUTPRO_API_KEY" \
  -H "Content-Type: application/json" \
  -H "Idempotency-Key: $(uuidgen)" \
  -d "$(jq -c --argjson credits "$CREDITS" '. + {credits: $credits}' <<< "$BODY")"
Read the docs

Questions

API questions before your first call

At 2k, each image costs $0.31 and 10 images come to $3.12 (R$10.44, 175 credits).
Create an account, make a key and send the request to the quote, which charges nothing. The smallest FLUX 3 Klein Image Base generation costs 18 credits, more than the 15 free ones: use those to try a cheaper model from the catalog.
Text only: the prompt describes everything. With references: up to 3 images guide the character, product or style.
No. Buy a credit pack by card, or in reais with Pix from Brazil, and spend it on FLUX 3 Klein Image Base and every other model with the same key.
No. The Cut.Pro key calls FLUX 3 Klein Image Base without a Black Forest Labs account, with one balance for every model in the catalog.
Yes. With a CPF or CNPJ and full address in your billing details, the nota fiscal is issued after each payment is confirmed.

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Generate with FLUX 3 Klein Image Base today

Create a key, get a free quote and pay only for what you generate.

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